Gojowczyk will face Australia’s Matthew Ebden, a 4-6, 7-6 (6), 6-4 winner over Germany’s Tobias Kamke. Ebden is the first qualifier to reach the semis on Newport’s grass courts since 2011.

Ebden upset sixth-seeded Lukas Lacko in the second round.

The other quarterfinal matches are Friday. Top-seeded John Isner, the big-serving American who won the tournament in 2011 and 2012, will play fellow countryman Dennis Novikov. No. 4 Pierre-Hugues Herbert of France will face American Bjorn Fratangelo.